> Pretty much every hotel in Japan has a laundry machine, although I don't know of any suites that include one, unless you're going for a managed apartment.

Which is insanely expensive compared to just going down the street to a normal coin laundromat. They are pretty much anywhere (at least in most big cities) and very quick and cheap. You can pay 500 yen at a laundromat, or 5000 yen at your hotel laundry room.